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    <li class="nav-header no-margin-top">
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The date that this version of MRO-Compat was released.">
      <span class="relatize">06 Jan 2022 15:22:06 UTC</span>
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  <li>
    Distribution: <a href="https://metacpan.org/dist/MRO-Compat">MRO-Compat</a>
  </li>
  <li>
    Module version: 0.15
  </li>
  <li>
    <a data-keyboard-shortcut="g s" href="https://metacpan.org/dist/MRO-Compat/source/lib/MRO/Compat.pm">Source</a>
    (<a href="https://metacpan.org/dist/MRO-Compat/source/lib/MRO/Compat.pm?raw=1">raw</a>)
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    <a data-keyboard-shortcut="g b" href="https://metacpan.org/dist/MRO-Compat/source/lib/MRO">Browse</a>
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      <a class="nopopup" href="https://metacpan.org/dist/MRO-Compat/contribute">How to Contribute</a>
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        <a rel="noopener nofollow" data-keyboard-shortcut="g r" href="https://github.com/moose/MRO-Compat">Repository</a>
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      <a rel="noopener nofollow" data-keyboard-shortcut="g i" href="https://rt.cpan.org/Public/Dist/Display.html?Name=MRO-Compat">Issues</a>
      (0)
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    <li>
      <a rel="noopener nofollow" href="http://matrix.cpantesters.org/?dist=MRO-Compat+0.15" title="Matrix">Testers</a>
        <span title="(pass / fail / na)">(<a rel="noopener nofollow" href="https://www.cpantesters.org/distro/M/MRO-Compat.html?oncpan=1&amp;distmat=1&amp;version=0.15&amp;grade=2" style="color: #090">4936</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/M/MRO-Compat.html?oncpan=1&amp;distmat=1&amp;version=0.15&amp;grade=3" style="color: #900">0</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/M/MRO-Compat.html?oncpan=1&amp;distmat=1&amp;version=0.15&amp;grade=4">0</a>)</span>
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    <li>
      <a rel="noopener nofollow" href="http://cpants.cpanauthors.org/release/HAARG/MRO-Compat-0.15">Kwalitee</a>
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    <li>
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The # people with an indexing permission on MRO-Compat who have released something to CPAN in the last 2 years (i.e. the # people likely able to release critical fixes in a timely manner)">
      Bus factor: 3
      </div>
    </li>
    <li>
      <a rel="noopener nofollow" href="http://cpancover.com/latest/MRO-Compat-0.15/index.html">17.13% Coverage </a>
    </li>
    <li>
      License: perl_5
    </li>
    <li>
      Perl: v5.6.0
    </li>
    <li class="nav-header">Activity</li>
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    <div class="comment">24 month</div>
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      <a itemprop="downloadUrl" href="https://cpan.metacpan.org/authors/id/H/HA/HAARG/MRO-Compat-0.15.tar.gz">
      Download (<span itemprop="fileSize">16.12KB</span>)</a>
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<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/MRO/Compat.pm&#39;" class="form-control tool-bar-form">
  <option disabled selected>Jump to version</option>
<option
  disabled
  value="HAARG/MRO-Compat-0.15"
>0.15
  (HAARG on 2022-01-06)</option>
<option
  
  value="HAARG/MRO-Compat-0.14_01"
>0.14_01 DEV
  (HAARG on 2020-11-16)</option>
<option
  
  value="HAARG/MRO-Compat-0.13"
>0.13
  (HAARG on 2017-03-28)</option>
<option
  
  value="BOBTFISH/MRO-Compat-0.12"
>0.12
  (BOBTFISH on 2012-12-04)</option>
<option
  
  value="FLORA/MRO-Compat-0.11"
>0.11
  (FLORA on 2009-05-27)</option>
<option
  
  value="FLORA/MRO-Compat-0.10"
>0.10
  (FLORA on 2009-03-24)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.09"
>0.09
  (BLBLACK on 2008-06-05)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.08_01"
>0.08_01 DEV
  (BLBLACK on 2008-06-02)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.07"
>0.07
  (BLBLACK on 2008-05-20)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.06_01"
>0.06_01 DEV
  (BLBLACK on 2008-05-19)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.05"
>0.05
  (BLBLACK on 2007-09-09)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.04"
>0.04
  (BLBLACK on 2007-07-18)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.03"
>0.03
  (BLBLACK on 2007-06-04)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.02"
>0.02
  (BLBLACK on 2007-05-13)</option>
<optgroup label="BackPAN">'
<option
  
  value="BLBLACK/MRO-Compat-0.01_01"
>0.01_01 DEV
  (BLBLACK on 2007-05-11)</option>
</optgroup>
</select>
    </li>
    <li class="version-diff">
<select onchange="document.location.href='/release/HAARG/MRO-Compat-0.15/diff/' + encodeURIComponent(this.value) + '/lib/MRO/Compat.pm'
" class="form-control tool-bar-form">
  <option disabled selected>Diff with version</option>
<option
  disabled
  value="HAARG/MRO-Compat-0.15"
>0.15
  (HAARG on 2022-01-06)</option>
<option
  
  value="HAARG/MRO-Compat-0.14_01"
>0.14_01 DEV
  (HAARG on 2020-11-16)</option>
<option
  
  value="HAARG/MRO-Compat-0.13"
>0.13
  (HAARG on 2017-03-28)</option>
<option
  
  value="BOBTFISH/MRO-Compat-0.12"
>0.12
  (BOBTFISH on 2012-12-04)</option>
<option
  
  value="FLORA/MRO-Compat-0.11"
>0.11
  (FLORA on 2009-05-27)</option>
<option
  
  value="FLORA/MRO-Compat-0.10"
>0.10
  (FLORA on 2009-03-24)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.09"
>0.09
  (BLBLACK on 2008-06-05)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.08_01"
>0.08_01 DEV
  (BLBLACK on 2008-06-02)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.07"
>0.07
  (BLBLACK on 2008-05-20)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.06_01"
>0.06_01 DEV
  (BLBLACK on 2008-05-19)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.05"
>0.05
  (BLBLACK on 2007-09-09)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.04"
>0.04
  (BLBLACK on 2007-07-18)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.03"
>0.03
  (BLBLACK on 2007-06-04)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.02"
>0.02
  (BLBLACK on 2007-05-13)</option>
<optgroup label="BackPAN">'
<option
  
  value="BLBLACK/MRO-Compat-0.01_01"
>0.01_01 DEV
  (BLBLACK on 2007-05-11)</option>
</optgroup>
</select>
    </li>

    <li>
<ul class="dependencies">
  <li class="nav-header">Dependencies</li>
  <li><i class="ttip" title="dynamic_config enabled">unknown</i></li>
  <li>
    <hr>
  </li>
  <li>
    <a href="https://metacpan.org/module/MRO::Compat/requires">Reverse dependencies</a>
  </li>
  <li>
    <a href="http://deps.cpantesters.org/?module=MRO%3A%3ACompat">CPAN Testers List</a>
  </li>
  <li>
    <a href="https://cpandeps.grinnz.com/?dist=MRO-Compat">Dependency graph</a>
  </li>
</ul>
    </li>
    <li class="nav-header">Permalinks</li>
    <li>
      <a href="https://metacpan.org/release/HAARG/MRO-Compat-0.15/view/lib/MRO/Compat.pm">This version</a>
    </li>
    <li>
      <a href="./MRO::Compat.html">Latest version</a>
    </li>
    <li>
<div class="plussers">
<div class="nav-header">++ed by:</div>
<div>
<a class="display-all" href="https://metacpan.org/author/KEEDI"><img src="https://www.gravatar.com/avatar/95f905a7a4ccc573c711e9d264c0fde8?d=identicon&amp;s=20" title="KEEDI" alt="KEEDI"></a>
</div>
<!-- Display counts of plussers-->
<div>
    <a href="https://metacpan.org/dist/MRO-Compat/plussers">1 PAUSE user</a>
</div>
<div>
    2 non-PAUSE users
</div>
</div>
    </li>
    <li>
<div id="metacpan_contributors">
  <div>
    <button class="btn-link"
      onclick="$(this).hide(); $('#metacpan_contributors ul').slideDown(); return false;"
    >and 1 contributors</button>
  </div>
  <ul style="display: none">
    <li class="contributor"
      data-cpan-author="BLBLACK"
      data-contrib-email="blblack@gmail.com"
    >
      <a href="https://metacpan.org/author/BLBLACK" class="cpan-author">
      <img class="gravatar" width="20" height="20" src="https://www.gravatar.com/avatar/5496172744d8328f4b950e2f19caa503?d=identicon&amp;s=20" />
      Brandon L. Black
      </a>
    </li>
  </ul>
</div>
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  <span>
    <a data-keyboard-shortcut="g a" rel="author" href="https://metacpan.org/author/HAARG" class="author-name">Graham Knop</a>
  </span>
  <span>&nbsp;/&nbsp;</span>
  <div class="release dist-release status-latest maturity-released">
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<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/MRO/Compat.pm&#39;" class="">
<option
  selected
  value="HAARG/MRO-Compat-0.15"
>0.15
  (HAARG on 2022-01-06)</option>
<option
  
  value="HAARG/MRO-Compat-0.14_01"
>0.14_01 DEV
  (HAARG on 2020-11-16)</option>
<option
  
  value="HAARG/MRO-Compat-0.13"
>0.13
  (HAARG on 2017-03-28)</option>
<option
  
  value="BOBTFISH/MRO-Compat-0.12"
>0.12
  (BOBTFISH on 2012-12-04)</option>
<option
  
  value="FLORA/MRO-Compat-0.11"
>0.11
  (FLORA on 2009-05-27)</option>
<option
  
  value="FLORA/MRO-Compat-0.10"
>0.10
  (FLORA on 2009-03-24)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.09"
>0.09
  (BLBLACK on 2008-06-05)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.08_01"
>0.08_01 DEV
  (BLBLACK on 2008-06-02)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.07"
>0.07
  (BLBLACK on 2008-05-20)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.06_01"
>0.06_01 DEV
  (BLBLACK on 2008-05-19)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.05"
>0.05
  (BLBLACK on 2007-09-09)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.04"
>0.04
  (BLBLACK on 2007-07-18)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.03"
>0.03
  (BLBLACK on 2007-06-04)</option>
<option
  
  value="BLBLACK/MRO-Compat-0.02"
>0.02
  (BLBLACK on 2007-05-13)</option>
<optgroup label="BackPAN">'
<option
  
  value="BLBLACK/MRO-Compat-0.01_01"
>0.01_01 DEV
  (BLBLACK on 2007-05-11)</option>
</optgroup>
</select>
    <a data-keyboard-shortcut="g d" class="release-name" href="https://metacpan.org/dist/MRO-Compat">MRO-Compat-0.15</a>
  </div>
<span class="river-gauge-gauge">
  <svg width="24px"
       height="15px"
       version="1.1"
       xmlns="http://www.w3.org/2000/svg"
       xmlns:xlink="http://www.w3.org/1999/xlink">

    <g>
      <title>        River stage four &#10;
          • 172 direct dependents &#10;          • 7480 total dependents
      </title>

      <rect x="0"  y="0" width="4" height="15" fill="#7ea3f2" />
      <rect x="5"  y="0" width="4" height="15" fill="#7ea3f2" />
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      <rect x="20"  y="0" width="4" height="15" fill="#e4e2e2" />
    </g>
  </svg>

</span>
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</form>
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<a href="./MRO::Compat.html" onclick="alert('Please sign in to add favorites'); return false" class="favorite highlight">
<span>3</span> ++</a>
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   / <span>MRO::Compat</span>
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  <div class="toc-header"><strong>Contents</strong></div>
<ul>
  <li><a href="./MRO::Compat.html#NAME">NAME</a></li>
  <li><a href="./MRO::Compat.html#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="./MRO::Compat.html#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="./MRO::Compat.html#Functions">Functions</a>
    <ul>
      <li><a href="./MRO::Compat.html#mro::get_linear_isa($classname%5B,-$type%5D)">mro::get_linear_isa($classname[, $type])</a></li>
      <li><a href="./MRO::Compat.html#mro::import">mro::import</a></li>
      <li><a href="./MRO::Compat.html#mro::set_mro($classname,-$type)">mro::set_mro($classname, $type)</a></li>
      <li><a href="./MRO::Compat.html#mro::get_mro($classname)">mro::get_mro($classname)</a></li>
      <li><a href="./MRO::Compat.html#mro::get_isarev($classname)">mro::get_isarev($classname)</a></li>
      <li><a href="./MRO::Compat.html#mro::is_universal($classname)">mro::is_universal($classname)</a></li>
      <li><a href="./MRO::Compat.html#mro::invalidate_all_method_caches">mro::invalidate_all_method_caches</a></li>
      <li><a href="./MRO::Compat.html#mro::method_changed_in($classname)">mro::method_changed_in($classname)</a></li>
      <li><a href="./MRO::Compat.html#mro::get_pkg_gen($classname)">mro::get_pkg_gen($classname)</a></li>
    </ul>
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  <li><a href="./MRO::Compat.html#USING-C3">USING C3</a></li>
  <li><a href="./MRO::Compat.html#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="./MRO::Compat.html#AUTHOR">AUTHOR</a></li>
  <li><a href="./MRO::Compat.html#COPYRIGHT-AND-LICENSE">COPYRIGHT AND LICENSE</a></li>
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<div class="pod anchors">
<h1 id="NAME">NAME</h1>

<p>MRO::Compat - mro::* interface compatibility for Perls &lt; 5.9.5</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>   package PPP;      use base qw/Exporter/;
   package X;        use base qw/PPP/;
   package Y;        use base qw/PPP/;
   package Z;        use base qw/PPP/;

   package FooClass; use base qw/X Y Z/;

   package main;
   use MRO::Compat;
   my $linear = mro::get_linear_isa(&#39;FooClass&#39;);
   print join(q{, }, @$linear);

   # Prints: FooClass, X, PPP, Exporter, Y, Z</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The &quot;mro&quot; namespace provides several utilities for dealing with method resolution order and method caching in general in Perl 5.9.5 and higher.</p>

<p>This module provides those interfaces for earlier versions of Perl (back to 5.6.0 anyways).</p>

<p>It is a harmless no-op to use this module on 5.9.5+. That is to say, code which properly uses <a href="./MRO::Compat.html">MRO::Compat</a> will work unmodified on both older Perls and 5.9.5+.</p>

<p>If you&#39;re writing a piece of software that would like to use the parts of 5.9.5+&#39;s mro:: interfaces that are supported here, and you want compatibility with older Perls, this is the module for you.</p>

<p>Some parts of this code will work better and/or faster with <a href="https://metacpan.org/pod/Class::C3::XS">Class::C3::XS</a> installed (which is an optional prereq of <a href="./Class::C3.html">Class::C3</a>, which is in turn a prereq of this package), but it&#39;s not a requirement.</p>

<p>This module never exports any functions. All calls must be fully qualified with the <code>mro::</code> prefix.</p>

<p>The interface documentation here serves only as a quick reference of what the function basically does, and what differences between <a href="./MRO::Compat.html">MRO::Compat</a> and 5.9.5+ one should look out for. The main docs in 5.9.5&#39;s <a href="https://metacpan.org/pod/mro">mro</a> are the real interface docs, and contain a lot of other useful information.</p>

<h1 id="Functions">Functions</h1>

<h2 id="mro::get_linear_isa($classname[,-$type])"><a id="mro"></a><a id="mro::get_linear_isa-classname---type"></a>mro::get_linear_isa($classname[, $type])</h2>

<p>Returns an arrayref which is the linearized &quot;ISA&quot; of the given class. Uses whichever MRO is currently in effect for that class by default, or the given MRO (either <code>c3</code> or <code>dfs</code> if specified as <code>$type</code>).</p>

<p>The linearized ISA of a class is a single ordered list of all of the classes that would be visited in the process of resolving a method on the given class, starting with itself. It does not include any duplicate entries.</p>

<p>Note that <code>UNIVERSAL</code> (and any members of <code>UNIVERSAL</code>&#39;s MRO) are not part of the MRO of a class, even though all classes implicitly inherit methods from <code>UNIVERSAL</code> and its parents.</p>

<h2 id="mro::import"><a id="mro1"></a>mro::import</h2>

<p>This allows the <code>use mro &#39;dfs&#39;</code> and <code>use mro &#39;c3&#39;</code> syntaxes, providing you <code>use MRO::Compat</code> first. Please see the <a href="./MRO::Compat.html#USING-C3">&quot;USING C3&quot;</a> section for additional details.</p>

<h2 id="mro::set_mro($classname,-$type)"><a id="mro2"></a><a id="mro::set_mro-classname---type"></a>mro::set_mro($classname, $type)</h2>

<p>Sets the mro of <code>$classname</code> to one of the types <code>dfs</code> or <code>c3</code>. Please see the <a href="./MRO::Compat.html#USING-C3">&quot;USING C3&quot;</a> section for additional details.</p>

<h2 id="mro::get_mro($classname)"><a id="mro3"></a><a id="mro::get_mro-classname"></a>mro::get_mro($classname)</h2>

<p>Returns the MRO of the given class (either <code>c3</code> or <code>dfs</code>).</p>

<p>It considers any Class::C3-using class to have C3 MRO even before <a href="https://metacpan.org/pod/Class::C3::initialize()">Class::C3::initialize()</a> is called.</p>

<h2 id="mro::get_isarev($classname)"><a id="mro4"></a><a id="mro::get_isarev-classname"></a>mro::get_isarev($classname)</h2>

<p>Returns an arrayref of classes who are subclasses of the given classname. In other words, classes in whose @ISA hierarchy we appear, no matter how indirectly.</p>

<p>This is much slower on pre-5.9.5 Perls with MRO::Compat than it is on 5.9.5+, as it has to search the entire package namespace.</p>

<h2 id="mro::is_universal($classname)"><a id="mro5"></a><a id="mro::is_universal-classname"></a>mro::is_universal($classname)</h2>

<p>Returns a boolean status indicating whether or not the given classname is either <code>UNIVERSAL</code> itself, or one of <code>UNIVERSAL</code>&#39;s parents by <code>@ISA</code> inheritance.</p>

<p>Any class for which this function returns true is &quot;universal&quot; in the sense that all classes potentially inherit methods from it.</p>

<h2 id="mro::invalidate_all_method_caches"><a id="mro6"></a>mro::invalidate_all_method_caches</h2>

<p>Increments <code>PL_sub_generation</code>, which invalidates method caching in all packages.</p>

<p>Please note that this is rarely necessary, unless you are dealing with a situation which is known to confuse Perl&#39;s method caching.</p>

<h2 id="mro::method_changed_in($classname)"><a id="mro7"></a><a id="mro::method_changed_in-classname"></a>mro::method_changed_in($classname)</h2>

<p>Invalidates the method cache of any classes dependent on the given class. In <a href="./MRO::Compat.html">MRO::Compat</a> on pre-5.9.5 Perls, this is an alias for <code>mro::invalidate_all_method_caches</code> above, as pre-5.9.5 Perls have no other way to do this. It will still enforce the requirement that you pass it a classname, for compatibility.</p>

<p>Please note that this is rarely necessary, unless you are dealing with a situation which is known to confuse Perl&#39;s method caching.</p>

<h2 id="mro::get_pkg_gen($classname)"><a id="mro8"></a><a id="mro::get_pkg_gen-classname"></a>mro::get_pkg_gen($classname)</h2>

<p>Returns an integer which is incremented every time a local method of or the <code>@ISA</code> of the given package changes on Perl 5.9.5+. On earlier Perls with this <a href="./MRO::Compat.html">MRO::Compat</a> module, it will probably increment a lot more often than necessary.</p>

<h1 id="USING-C3"><a id="USING"></a>USING C3</h1>

<p>While this module makes the 5.9.5+ syntaxes <code>use mro &#39;c3&#39;</code> and <code>mro::set_mro(&quot;Foo&quot;, &#39;c3&#39;)</code> available on older Perls, it does so merely by passing off the work to <a href="./Class::C3.html">Class::C3</a>.</p>

<p>It does not remove the need for you to call <code>Class::C3::initialize()</code>, <code>Class::C3::reinitialize()</code>, and/or <code>Class::C3::uninitialize()</code> at the appropriate times as documented in the <a href="./Class::C3.html">Class::C3</a> docs. These three functions are always provided by <a href="./MRO::Compat.html">MRO::Compat</a>, either via <a href="./Class::C3.html">Class::C3</a> itself on older Perls, or directly as no-ops on 5.9.5+.</p>

<h1 id="SEE-ALSO"><a id="SEE"></a>SEE ALSO</h1>

<p><a href="./Class::C3.html">Class::C3</a></p>

<p><a href="https://metacpan.org/pod/mro">mro</a></p>

<h1 id="AUTHOR">AUTHOR</h1>

<p>Brandon L. Black, &lt;blblack@gmail.com&gt;</p>

<h1 id="COPYRIGHT-AND-LICENSE"><a id="COPYRIGHT"></a>COPYRIGHT AND LICENSE</h1>

<p>Copyright 2007-2008 Brandon L. Black &lt;blblack@gmail.com&gt;</p>

<p>This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.</p></div>

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